﻿// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Text;

namespace Microsoft.Practices.EnterpriseLibrary.Validation.Validators
{
    /// <summary>
    /// Base generic validator for member access validation.
    /// </summary>
    /// <typeparam name="T">The type for which validation on a member is to be performed.</typeparam>
    public abstract class MemberAccessValidator<T> : Validator<T>
    {
        private ValueAccessValidator valueAccessValidator;

        /// <summary>
        /// <para>Initializes a new instance of the <see cref="MemberAccessValidator{T}"/> class.</para>
        /// </summary>
        /// <param name="valueAccess">The <see cref="ValueAccess"/> to use when accessing the
        /// value of the validated member.</param>
        /// <param name="valueValidator">The <see cref="Validator"/> to validate the value of the
        /// validated member.</param>
        protected MemberAccessValidator(ValueAccess valueAccess, Validator valueValidator)
            : base(null, null)
        {
            this.valueAccessValidator = new ValueAccessValidator(valueAccess, valueValidator);
            Validator = valueValidator;
        }

        /// <summary>
        /// Validates extracting a value from <paramref name="objectToValidate"/> and applying a validator
        /// to it.
        /// </summary>
        /// <param name="objectToValidate">The object to validate.</param>
        /// <param name="currentTarget">The object on the behalf of which the validation is performed.</param>
        /// <param name="key">The key that identifies the source of <paramref name="objectToValidate"/>.</param>
        /// <param name="validationResults">The validation results to which the outcome of the validation should be stored.</param>
        protected override void DoValidate(T objectToValidate, object currentTarget, string key, 
            ValidationResults validationResults)
        {
            this.valueAccessValidator.DoValidate(objectToValidate, currentTarget, key, validationResults);
        }

        /// <summary>
        /// Gets the message template to use when logging results no message is supplied.
        /// </summary>
        protected override string DefaultMessageTemplate
        {
            get { return null; }
        }

        /// <summary>
        /// The actual validator that gets run against this field.
        /// </summary>
        public Validator Validator
        {
            get; private set;
        }

        /// <summary>
        /// Key used to access the value.
        /// </summary>
        public string Key
        {
            get { return valueAccessValidator.Key; }
        }
    }
}
